This is the most annoying thing I have found with the iOS 5 betas. Every time I start playing music and stay listening for a while, when I wanna go to a different album or something, the back button on the music app gets replaced by a store one that takes me to the iTunes Store, and I always end up clicking it (after all, I have been using that button to get back for 4 years), I don't wanna purchase anything!!!! Is this by design or just a silly bug? If it is by design, hope that Apple gets enough negative feedback to remove it once it is released!